PM DR, Querier and Assert message
on a multiaccess LAN,
DR is responsible for "PIM" Register/Prune messages toward RP.
IGMP Querier is responsible for IGMP "host-query" messages.
With IGMPv1, since there is no concept of Querier, PIM DR typically serves both the PIM routers and IGMP hosts (think of it as an additional responsibility).
With IGMPv2, there IS an election, so router with lower ip address serves the hosts (as an IGMP Querier) and router with higher ip address serves PIM routers (as PIM-DR).
The winner of Assert process is responsible for forwading multicast onto LAN
DR is responsible for "PIM" Register/Prune messages toward RP.
IGMP Querier is responsible for IGMP "host-query" messages.
With IGMPv1, since there is no concept of Querier, PIM DR typically serves both the PIM routers and IGMP hosts (think of it as an additional responsibility).
With IGMPv2, there IS an election, so router with lower ip address serves the hosts (as an IGMP Querier) and router with higher ip address serves PIM routers (as PIM-DR).
The winner of Assert process is responsible for forwading multicast onto LAN
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